INFO: task can't die in fb_open
1 view
Skip to first unread message
syzbot
Jul 26, 2020, 2:24:18 PM7/26/20
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 73aece61 Add linux-next specific files for 20200722
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=108d7d27100000
kernel config: https://syzkaller.appspot.com/x/.config?x=7305a292ff00f0b2
dashboard link: https://syzkaller.appspot.com/bug?extid=b2a818c37518c273a08f
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [b.zoln...@samsung.com daniel...@ffwll.ch dri-...@lists.freedesktop.org ge...@linux-m68k.org jani....@intel.com kra...@redhat.com linux...@vger.kernel.org linux-...@vger.kernel.org natecha...@gmail.com nor...@tronnes.org pe...@axentia.se s...@ravnborg.org]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b2a818...@syzkaller.appspotmail.com
INFO: task syz-executor.5:28384 can't die for more than 143 seconds.
syz-executor.5 D28616 28384 7352 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffd1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007fff6dc2982f R14: 00007fb83ffd29c0 R15: 000000000078bfac
INFO: task syz-executor.5:28384 blocked for more than 143 seconds.
Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28616 28384 7352 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffd1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007fff6dc2982f R14: 00007fb83ffd29c0 R15: 000000000078bfac
INFO: task syz-executor.5:28387 can't die for more than 143 seconds.
syz-executor.5 D28432 28387 7352 0x00000004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffb0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078c088 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007fff6dc2982f R14: 00007fb83ffb19c0 R15: 000000000078c04c
INFO: task syz-executor.5:28387 blocked for more than 143 seconds.
Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28432 28387 7352 0x00000004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffb0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078c088 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007fff6dc2982f R14: 00007fb83ffb19c0 R15: 000000000078c04c
Showing all locks held in the system:
1 lock held by khungtaskd/1150:
#0: ffffffff89c52bc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5817
1 lock held by in:imklog/6664:
#0: ffff888094816af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
2 locks held by syz-executor.3/28148:
1 lock held by syz-executor.5/28384:
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline]
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor.5/28387:
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline]
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1150 Comm: khungtaskd Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
watchdog+0xd89/0xf30 kernel/hung_task.c:339
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 28148 Comm: syz-executor.3 Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x20 kernel/kcov.c:258
Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 4c ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f
RSP: 0018:ffffc90015e1f5c8 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000050 RCX: ffffffff83c8ae34
RDX: ffff8880947100c0 RSI: 000000000000001c RDI: 0000000000000050
RBP: 000000000000001c R08: 0000000000000001 R09: ffff8882188c05df
R10: 0000000000000050 R11: 0000000000000000 R12: ffff8880000a001c
R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000ef16805c
FS: 00007f1f3f698700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561eca7f9e48 CR3: 0000000097aef000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vga16fb_fillrect+0x9d4/0x193b drivers/video/fbdev/vga16fb.c:922
bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1d5/0x230 drivers/video/fbdev/core/fbcon.c:1381
fbcon_switch+0xb6f/0x16c0 drivers/video/fbdev/core/fbcon.c:2363
redraw_screen+0x2af/0x770 drivers/tty/vt/vt.c:1020
fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001
fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007f1f3f697c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000d440 RCX: 000000000045c1f9
RDX: 0000000020000200 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffccee0d4af R14: 00007f1f3f6989c0 R15: 000000000078bf0c
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 73aece61 Add linux-next specific files for 20200722
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=108d7d27100000
kernel config: https://syzkaller.appspot.com/x/.config?x=7305a292ff00f0b2
dashboard link: https://syzkaller.appspot.com/bug?extid=b2a818c37518c273a08f
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [b.zoln...@samsung.com daniel...@ffwll.ch dri-...@lists.freedesktop.org ge...@linux-m68k.org jani....@intel.com kra...@redhat.com linux...@vger.kernel.org linux-...@vger.kernel.org natecha...@gmail.com nor...@tronnes.org pe...@axentia.se s...@ravnborg.org]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b2a818...@syzkaller.appspotmail.com
INFO: task syz-executor.5:28384 can't die for more than 143 seconds.
syz-executor.5 D28616 28384 7352 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffd1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007fff6dc2982f R14: 00007fb83ffd29c0 R15: 000000000078bfac
INFO: task syz-executor.5:28384 blocked for more than 143 seconds.
Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28616 28384 7352 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffd1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007fff6dc2982f R14: 00007fb83ffd29c0 R15: 000000000078bfac
INFO: task syz-executor.5:28387 can't die for more than 143 seconds.
syz-executor.5 D28432 28387 7352 0x00000004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffb0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078c088 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007fff6dc2982f R14: 00007fb83ffb19c0 R15: 000000000078c04c
INFO: task syz-executor.5:28387 blocked for more than 143 seconds.
Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28432 28387 7352 0x00000004
Call Trace:
context_switch kernel/sched/core.c:3533 [inline]
__schedule+0x908/0x21e0 kernel/sched/core.c:4289
schedule+0xd0/0x2a0 kernel/sched/core.c:4364
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4423
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:638 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x11b0 fs/open.c:827
do_open fs/namei.c:3249 [inline]
path_openat+0x1b97/0x2720 fs/namei.c:3366
do_filp_open+0x17e/0x3c0 fs/namei.c:3393
do_sys_openat2+0x16d/0x3e0 fs/open.c:1178
do_sys_open fs/open.c:1194 [inline]
__do_sys_openat fs/open.c:1210 [inline]
__se_sys_openat fs/open.c:1205 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1205
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fb83ffb0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020f00 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078c088 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007fff6dc2982f R14: 00007fb83ffb19c0 R15: 000000000078c04c
Showing all locks held in the system:
1 lock held by khungtaskd/1150:
#0: ffffffff89c52bc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5817
1 lock held by in:imklog/6664:
#0: ffff888094816af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
2 locks held by syz-executor.3/28148:
1 lock held by syz-executor.5/28384:
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline]
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor.5/28387:
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline]
#0: ffff8882188d0078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1150 Comm: khungtaskd Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
watchdog+0xd89/0xf30 kernel/hung_task.c:339
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 28148 Comm: syz-executor.3 Not tainted 5.8.0-rc6-next-20200722-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x20 kernel/kcov.c:258
Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 4c ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f
RSP: 0018:ffffc90015e1f5c8 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000050 RCX: ffffffff83c8ae34
RDX: ffff8880947100c0 RSI: 000000000000001c RDI: 0000000000000050
RBP: 000000000000001c R08: 0000000000000001 R09: ffff8882188c05df
R10: 0000000000000050 R11: 0000000000000000 R12: ffff8880000a001c
R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000ef16805c
FS: 00007f1f3f698700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561eca7f9e48 CR3: 0000000097aef000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vga16fb_fillrect+0x9d4/0x193b drivers/video/fbdev/vga16fb.c:922
bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1d5/0x230 drivers/video/fbdev/core/fbcon.c:1381
fbcon_switch+0xb6f/0x16c0 drivers/video/fbdev/core/fbcon.c:2363
redraw_screen+0x2af/0x770 drivers/tty/vt/vt.c:1020
fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001
fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007f1f3f697c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000d440 RCX: 000000000045c1f9
RDX: 0000000020000200 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffccee0d4af R14: 00007f1f3f6989c0 R15: 000000000078bf0c
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jul 27, 2020, 1:20:00 AM7/27/20
to Tetsuo Handa, penguin...@i-love.sakura.ne.jp, syzkaller-upst...@googlegroups.com
> Unless this happens with next-20200724 or later, this will be a dup of
> stalling report inside bit_clear_margins() from fbcon_clear_margins().
>
> #syz dup: KASAN: vmalloc-out-of-bounds Write in bitfill_aligned
Your 'dup:' command is accepted, but please keep syzkaller-upst...@googlegroups.com mailing list in CC next time. It serves as a history of what happened with each bug report. Thank you.
> stalling report inside bit_clear_margins() from fbcon_clear_margins().
>
> #syz dup: KASAN: vmalloc-out-of-bounds Write in bitfill_aligned
Your 'dup:' command is accepted, but please keep syzkaller-upst...@googlegroups.com mailing list in CC next time. It serves as a history of what happened with each bug report. Thank you.
Reply all
Reply to author
Forward
0 new messages